Abstract

We have fabricated a bolometer using a transition-edge sensor (TES) made of Aldoped with Mn to suppress the superconducting critical temperature of Al from . The resulting detector exhibits low-frequency noise consistent with theory, with a noise-equivalent power of . The addition of Mn impurities did not significantly increase the heat capacity of the TES. In addition, the detector is surprisingly insensitive to applied magnetic fields. The use of AlMn alloy films in arrays of TES detectors has advantages in simplicity of fabrication when compared to traditional bilayer fabrication techniques.